fixed compatibility with CMake 2.4.6

git-svn-id: https://code.ros.org/svn/opencv/trunk@1781 73c94f0f-984f-4a5f-82bc-2d8db8d8ee08

diff --git a/opencv/CMakeLists.txt b/opencv/CMakeLists.txt
index 1ffbdf79c6ceedc8d68325bc03f5c0fe697b088d..376cce84b4b4e7bf6a2cd48b2ef5609c46ec03f4 100644 (file)
--- a/opencv/CMakeLists.txt
+++ b/opencv/CMakeLists.txt
@@ -237,11 +237,13 @@ macro(CHECK_MODULE module_name define)
         if (${ALIAS_FOUND})
             set(${define} 1)
             foreach(P "${ALIAS_INCLUDE_DIRS}")
-                list(APPEND HIGHGUI_INCLUDE_DIRS ${${P}})
+                if (${P})
+                    list(APPEND HIGHGUI_INCLUDE_DIRS ${${P}})
+                endif()    
             endforeach()
 
             foreach(P "${ALIAS_LIBRARY_DIRS}")
-                if (${${P}})
+                if (${P})
                     list(APPEND HIGHGUI_LIBRARY_DIRS ${${P}})
                 endif()
             endforeach()